#include "tclInt.h"
#include "tclPort.h"
#ifdef TCL_DEBUG
# define DEBUG
# define RCHECK
#endif
#ifndef __CYGWIN32__
typedef unsigned long caddr_t;
#endif
union overhead {
union overhead *ov_next;
struct {
unsigned char ovu_magic0;
unsigned char ovu_index;
unsigned char ovu_unused;
unsigned char ovu_magic1;
#ifdef RCHECK
unsigned short ovu_rmagic;
unsigned long ovu_size;
#endif
} ovu;
#define ov_magic0 ovu.ovu_magic0
#define ov_magic1 ovu.ovu_magic1
#define ov_index ovu.ovu_index
#define ov_rmagic ovu.ovu_rmagic
#define ov_size ovu.ovu_size
};
#define MAGIC 0xef
#define RMAGIC 0x5555
#ifdef RCHECK
#define RSLOP sizeof (unsigned short)
#else
#define RSLOP 0
#endif
#define OVERHEAD (sizeof(union overhead) + RSLOP)
#define NBUCKETS 13
#define MAXMALLOC (1<<(NBUCKETS+2))
static union overhead *nextf[NBUCKETS];
#ifdef MSTATS
static unsigned int nmalloc[NBUCKETS+1];
#include <stdio.h>
#endif
#if defined(DEBUG) || defined(RCHECK)
#define ASSERT(p) if (!(p)) panic(# p)
#define RANGE_ASSERT(p) if (!(p)) panic(# p)
#else
#define ASSERT(p)
#define RANGE_ASSERT(p)
#endif
static void MoreCore _ANSI_ARGS_((int bucket));
char *
TclpAlloc(
unsigned int nbytes)
{
register union overhead *op;
register long bucket;
register unsigned amt;
if (nbytes + OVERHEAD >= MAXMALLOC) {
op = (union overhead *)TclpSysAlloc(nbytes+OVERHEAD, 0);
if (op == NULL) {
return NULL;
}
op->ov_magic0 = op->ov_magic1 = MAGIC;
op->ov_index = 0xff;
#ifdef MSTATS
nmalloc[NBUCKETS]++;
#endif
#ifdef RCHECK
op->ov_size = (nbytes + RSLOP - 1) & ~(RSLOP - 1);
op->ov_rmagic = RMAGIC;
*(unsigned short *)((caddr_t)(op + 1) + op->ov_size) = RMAGIC;
#endif
return (void *)(op+1);
}
#ifndef RCHECK
amt = 8;
bucket = 0;
#else
amt = 16;
bucket = 1;
#endif
while (nbytes + OVERHEAD > amt) {
amt <<= 1;
if (amt == 0) {
return (NULL);
}
bucket++;
}
ASSERT( bucket < NBUCKETS );
if ((op = nextf[bucket]) == NULL) {
MoreCore(bucket);
if ((op = nextf[bucket]) == NULL) {
return (NULL);
}
}
nextf[bucket] = op->ov_next;
op->ov_magic0 = op->ov_magic1 = MAGIC;
op->ov_index = (unsigned char) bucket;
#ifdef MSTATS
nmalloc[bucket]++;
#endif
#ifdef RCHECK
op->ov_size = (nbytes + RSLOP - 1) & ~(RSLOP - 1);
op->ov_rmagic = RMAGIC;
*(unsigned short *)((caddr_t)(op + 1) + op->ov_size) = RMAGIC;
#endif
return ((char *)(op + 1));
}
static void
MoreCore(
int bucket)
{
register union overhead *op;
register long sz;
long amt;
int nblks;
sz = 1 << (bucket + 3);
ASSERT(sz > 0);
amt = MAXMALLOC;
nblks = amt / sz;
ASSERT(nblks*sz == amt);
op = (union overhead *)TclpSysAlloc(amt, 1);
if (op == NULL) {
return;
}
nextf[bucket] = op;
while (--nblks > 0) {
op->ov_next = (union overhead *)((caddr_t)op + sz);
op = (union overhead *)((caddr_t)op + sz);
}
op->ov_next = (union overhead *)NULL;
}
void
TclpFree(
char *cp)
{
register long size;
register union overhead *op;
if (cp == NULL) {
return;
}
op = (union overhead *)((caddr_t)cp - sizeof (union overhead));
ASSERT(op->ov_magic0 == MAGIC);
ASSERT(op->ov_magic1 == MAGIC);
if (op->ov_magic0 != MAGIC || op->ov_magic1 != MAGIC) {
return;
}
RANGE_ASSERT(op->ov_rmagic == RMAGIC);
RANGE_ASSERT(*(unsigned short *)((caddr_t)(op + 1) + op->ov_size) == RMAGIC);
size = op->ov_index;
if ( size == 0xff ) {
#ifdef MSTATS
nmalloc[NBUCKETS]--;
#endif
TclpSysFree(op);
return;
}
ASSERT(size < NBUCKETS);
op->ov_next = nextf[size];
nextf[size] = op;
#ifdef MSTATS
nmalloc[size]--;
#endif
}
char *
TclpRealloc(
char *cp,
unsigned int nbytes)
{
int i;
union overhead *op;
int expensive;
unsigned long maxsize;
if (cp == NULL) {
return (TclpAlloc(nbytes));
}
op = (union overhead *)((caddr_t)cp - sizeof (union overhead));
ASSERT(op->ov_magic0 == MAGIC);
ASSERT(op->ov_magic1 == MAGIC);
if (op->ov_magic0 != MAGIC || op->ov_magic1 != MAGIC) {
return NULL;
}
RANGE_ASSERT(op->ov_rmagic == RMAGIC);
RANGE_ASSERT(*(unsigned short *)((caddr_t)(op + 1) + op->ov_size) == RMAGIC);
i = op->ov_index;
if (i == 0xff) {
op = (union overhead *) TclpSysRealloc(op, nbytes+OVERHEAD);
if (op == NULL) {
return NULL;
}
#ifdef MSTATS
nmalloc[NBUCKETS]++;
#endif
#ifdef RCHECK
op->ov_size = (nbytes + RSLOP - 1) & ~(RSLOP - 1);
*(unsigned short *)((caddr_t)(op + 1) + op->ov_size) = RMAGIC;
#endif
return (char *)(op+1);
}
maxsize = 1 << (i+3);
expensive = 0;
if ( nbytes + OVERHEAD > maxsize ) {
expensive = 1;
} else if ( i > 0 && nbytes + OVERHEAD < (maxsize/2) ) {
expensive = 1;
}
if (expensive) {
void *newp;
newp = TclpAlloc(nbytes);
if ( newp == NULL ) {
return NULL;
}
maxsize -= OVERHEAD;
if ( maxsize < nbytes )
nbytes = maxsize;
memcpy((VOID *) newp, (VOID *) cp, (size_t) nbytes);
TclpFree(cp);
return newp;
}
#ifdef RCHECK
op->ov_size = (nbytes + RSLOP - 1) & ~(RSLOP - 1);
*(unsigned short *)((caddr_t)(op + 1) + op->ov_size) = RMAGIC;
#endif
return(cp);
}
#ifdef MSTATS
void
mstats(
char *s)
{
register int i, j;
register union overhead *p;
int totfree = 0,
totused = 0;
fprintf(stderr, "Memory allocation statistics %s\nTclpFree:\t", s);
for (i = 0; i < NBUCKETS; i++) {
for (j = 0, p = nextf[i]; p; p = p->ov_next, j++)
fprintf(stderr, " %d", j);
totfree += j * (1 << (i + 3));
}
fprintf(stderr, "\nused:\t");
for (i = 0; i < NBUCKETS; i++) {
fprintf(stderr, " %d", nmalloc[i]);
totused += nmalloc[i] * (1 << (i + 3));
}
fprintf(stderr, "\n\tTotal small in use: %d, total free: %d\n",
totused, totfree);
fprintf(stderr, "\n\tNumber of big (>%d) blocks in use: %d\n",
MAXMALLOC, nmalloc[NBUCKETS]);
}
#endif